/**
* This function saves all the context that will be lost
* when a CPU and cluster enter a low power state.
*
* This function is called with cluster->context->lock held
*/
int appf_platform_save_context(struct appf_cluster *cluster, struct appf_cpu *cpu, unsigned flags)
{
appf_u32 saved_items = 0;
appf_u32 cluster_saved_items = 0;
struct appf_cpu_context *context = cpu->context;
struct appf_cluster_context *cluster_context = cluster->context;
int cluster_down;
dbg_prints("save step 1\n");
/* Save perf. monitors first, so we don't interfere too much with counts */
if (flags & APPF_SAVE_PMU)
{
save_performance_monitors(context->pmu_data);
saved_items |= SAVED_PMU;
}
dbg_prints("save step 2\n");
if (flags & APPF_SAVE_TIMERS)
{
save_a9_timers(context->timer_data, cluster->scu_address);
saved_items |= SAVED_TIMERS;
}
dbg_prints("save step 3\n");
if (flags & APPF_SAVE_VFP)
{
save_vfp(context->vfp_data);
saved_items |= SAVED_VFP;
}
dbg_prints("save step 4\n");
if(cluster->ic_address)
save_gic_interface(context->gic_interface_data, cluster->ic_address);
if(cluster->ic_address)
save_gic_distributor_private(context->gic_dist_private_data, cluster->ic_address);
/* TODO: check return value and quit if nonzero! */
dbg_prints("save step 5\n");
save_banked_registers(context->banked_registers);
save_cp15(context->cp15_data);
save_a9_other(context->other_data);
if (flags & APPF_SAVE_DEBUG)
{
save_a9_debug(context->debug_data);
saved_items |= SAVED_DEBUG;
}
dbg_prints("save step 6\n");
cluster_down = cluster->power_state >= 2;
// if (cluster_down)
{
if ((flags & APPF_SAVE_TIMERS) && cluster->cpu_version >= 0x0100)
{
save_a9_global_timer(cluster_context->global_timer_data, cluster->scu_address);
cluster_saved_items |= SAVED_GLOBAL_TIMER;
}
save_gic_distributor_shared(cluster_context->gic_dist_shared_data, cluster->ic_address);
}
save_control_registers(context);
save_mmu(context->mmu_data);
context->saved_items = saved_items;
dbg_prints("save step 7\n");
// if (cluster_down)
{
if(cluster->scu_address)
save_a9_scu(cluster_context->scu_data, cluster->scu_address);
if (flags & APPF_SAVE_L2)
{
save_pl310(cluster_context->l2_data, cluster->l2_address);
cluster_saved_items |= SAVED_L2;
}
cluster_context->saved_items = cluster_saved_items;
}
dbg_prints("save step 8\n");
/*
* DISABLE DATA CACHES
*
* First, disable, then clean+invalidate the L1 cache.
*
* Note that if L1 was to be dormant and we were the last CPU, we would only need to clean some key data
* out of L1 and clean+invalidate the stack.
*/
//asm volatile("mov r0,#0");
//asm volatile("mcr p15, 0, r0, c7, c5, 0");
//disable_clean_inv_dcache_v7_l1();
//v7_flush_dcache_all();
/*
* Next, disable cache coherency
*/
if (cluster->scu_address)
{
write_actlr(read_actlr() & ~A9_SMP_BIT);
}
dbg_prints("save step 9\n");
/*
* If the L2 cache is in use, there is still more to do.
*
* Note that if the L2 cache is not in use, we don't disable the MMU, as clearing the C bit is good enough.
*/
if (flags & APPF_SAVE_L2)
{
/*
* Disable the MMU (and the L2 cache if necessary), then clean+invalidate the stack in the L2.
* This all has to be done one assembler function as we can't use the C stack during these operations.
*/
dbg_print("falg=",flags)
disable_clean_inv_cache_pl310(cluster->l2_address, appf_platform_get_stack_pointer() - STACK_SIZE,
STACK_SIZE, cluster_down);
/*
* We need to partially or fully clean the L2, because we will enter reset with cacheing disabled
*/
// if (cluster_down)
{
/* Clean the whole thing */
//clean_pl310(cluster->l2_address);
// l2x0_flush_all();
}
// else
{
/*
* L2 staying on, so just clean everything this CPU will need before the MMU is reenabled
*
* TODO: some of this data won't change after boottime init, could be cleaned once during late_init
*/
// clean_range_pl310(cluster, sizeof(struct appf_cluster), cluster->l2_address);
// clean_range_pl310(cpu, sizeof(struct appf_cpu), cluster->l2_address);
// clean_range_pl310(context, sizeof(struct appf_cpu_context), cluster->l2_address);
// clean_range_pl310(context->mmu_data, MMU_DATA_SIZE, cluster->l2_address);
// clean_range_pl310(cluster_context, sizeof(struct appf_cluster_context), cluster->l2_address);
}
}
dbg_prints("save step 10\n");
return APPF_OK;
}
/**
* This function saves all the context that will be lost
* when a CPU and cluster enter a low power state.
*/
static void platform_save_context(struct cpu_cluster *cluster, struct cpu *pcpu)
{
struct cpu_context *context = &(pcpu->context);
struct cpu_cluster_context *cluster_context = &(cluster->context);
#if MAX_CPUS != 1
int cluster_down = 0;
#endif
/* Save perf. monitors first, so we don't interfere too much with counts */
save_performance_monitors(context->pmu_data);
save_a9_timers(context->timer_data, cluster->scu_address);
save_vfp(context->vfp_data);
save_gic_interface(context->gic_interface_data, pcpu->ic_address);
save_gic_distributor_private(context->gic_dist_private_data, cluster->ic_address);
save_cp15(context->cp15_data);
save_a9_other(context->other_data);
#if 0 //wschen 2011-07-28
save_a9_debug(context->debug_data);
#endif
#if MAX_CPUS != 1
if (cluster->power_state >= STATUS_DORMANT) {
cluster_down = 1;
}
#endif
#if MAX_CPUS != 1
if (cluster_down) {
#endif
save_a9_global_timer(cluster_context->global_timer_data, cluster->scu_address);
save_gic_distributor_shared(cluster_context->gic_dist_shared_data, cluster->ic_address);
#if MAX_CPUS != 1
}
#endif
save_control_registers(context);
save_mmu(context->mmu_data);
#if MAX_CPUS != 1
if (cluster_down) {
#endif
save_a9_scu(cluster_context->scu_data, cluster->scu_address);
save_pl310(cluster_context->l2_data, cluster->l2_address);
#if MAX_CPUS != 1
}
#endif
dormant_ret_flag = 0;
save_banked_registers(context->banked_registers);
if (dormant_ret_flag == 0) {
clean_dcache_v7_l1();
clean_pl310(cpu_cluster.l2_address);
if (e1_chip) {
disable_pl310(cpu_cluster.l2_address);
disable_cache_v7_l1();
if (cpu_cluster.power_state == STATUS_DORMANT) {
reg_write(SC_PWR_CON0, 0xE105); /* SRAM sleep */
} else {
reg_write(SC_PWR_CON0, 0xC12D); /* SRAM power down */
}
dsb();
if (cpu_cluster.power_state == STATUS_DORMANT) {
reg_write(SC_PWR_CON2, 0xE505); /* SRAM sleep */
} else {
reg_write(SC_PWR_CON2, 0xC52D); /* SRAM power down */
}
dsb();
}
return;
} else {
return;
}
}